Lumber cut-off machine



C. JOHNSON.

LUMBEB CUT-OFF MACHINE. APPLICATION FILED MAY I4.'I92I.

` 1,427,297, Patented Aug. 29, 1922.

2 SHEETSSHEET l.

III@ l C. JOHNSON.

LUMBER CUT-0FF MACHINE. APPLICATION FILED MAY I4. 192|.

Patented Aug. 29, 1922.

2 SHEETS-SHEET 2.

ff 24 ISE 27 I Y2a I E g /J 4Q?l 43 Para CHARLES` ,fenaison or nmnnaroms, MrNnEso'ra.

kLuivnsna cuir-Orr` MACHINE. n l

Specification "f.tterSPetnt- Patented Aug.-29,i19`22.-

Applicatonled May 14, 1921. Serial No. 469,731. l

d T0 all whom t may concern:

Be it known that 1, CHARLES Joi-INsoN, am a citizen of trie United States, residing at Minneapolis, in the county of Hennepin and State of lVlinnescta,` have invented certain `new and useful improvements' in Lumber Cut-0ff Machines; and l do hereby declare the'following to be a full, clear, Iand. exact description of the invention, such as' will enable others skilled in the artto which it appertains to makeand use the same.

My invention relates to'what is known as lumber cut-off machines, and which are used in box factories and wood-working mills,

generally, for cutting` long boa-rds into short sections of certain but different lengths; and the invention is directed to certain improvements in machines of this kind whereby improved actions are obtained,`all as will. hereinafter more fully appear.

y Generally stated, theinvention consists of f the novel devices and combinations of devices .hereinafter described and defined in the claims. f y salient .feature of the invention is vdirectedto improved means for moving the power-driven circular saw to'and from its work with an interrupted movementk or hesitation at the retracted positiomwhereby an;

ample period of time yis afforded for feeding the lumber in front of the saw and into position to be sawed off.;

In the accompanying;drawings, which illustrate the invention, like characters in-r several' dicate. like partsy throughout the views. Y i

.Referring to the drawings: I y v Fig. 1 is a plan view of thevimproved machine; 4 o

. Fig. 2 is a perspective showing the several .sections of the stop device; removed lfrom lthe shaft to which they are normally applied;

on the line 3 3 of. Fig. 1;

Fig. 5 is a fragmentary view .with some parts sectioned on ythe line 5 5 of Fig. .3, and other parts ,being shown in full.

As commercially constructed, the mechar` msm of the machine is mounted 1n or on a.

rectangular framework made up of laterally spaced plate-like side members 6, tabletop 7 and an inclined deck 8. The table top 7k v and. ydeck 8 te'the' frames members Btw gether` at their upper portions and tie-rods 9 connect the lower portions thereof.y Iny this' machine, a circle saw isused and this saw is driven indirectly from a motor, preferablyy anelectric motor, 10, therotor of which isA coupled to a transverse driving shaft 11 journaled in suitable bearing sleeves 12 on the frame members 6. 'The sleeves 1 2,

as shown, are formed rind'ependently of 'the' frame members 6,'are inserted therethrough and have Vflanges adapting them to'b'e bolted tok said frame members. The innerends off the sleeves 12 afford `bearings-for'fan -upstandingy bifurcated sawfsupporting frame 13 that operates as a rocker arm -and the lower endsof the .prongs of `whichare journaled on the inner ends `of thesleeves 12;

The .frame, 13, at its" upper end, has laterally spaced bearings in which a saw shaft or spindlev 14e is iournaled. `The projecting end of thek shaft/14 works through a segmental slot 15 formed in the `adjacent frame and this belt is kept taut by a ytightening pulley 2O journaled to arms 21l pivoted to the oscillatory7 frame 13 by ashaft'21a. The: numeral 22 indicates a main counter-shaftk thatv is journaled intheiframe members 6 and is provided -with a frame-operating c crank preferably afforded by a crank disk f 23 secured thereto and provided on its op` posite vfaces with wrist pins 24y and k25 set',

the former circumferentially ahead of 'the latter. Y f

`These wrist pins 24- and 25 co-operate, re-

spectively, with notches 26 and 27a in armconnected to the oscillatoryk frame 13, as

y shown, by` means of pivot studs 28.k -The Fig. f1 kis a section taken approximately' on the line 1 -4 of Fig. 3; and

'by a coiled. spring 29 4attached thereto and to-a .lug 3() on one ofthe frame members 6.

kThe main countershaft 22 is vdriven from the main' driving shaft 11 by suitable transmission mechan1sm,'which,ias shown, comf prises as follows: d

The numeral`31- indicates a belt that runs over a pulley 32 on the shaft 11 and over a oraison.

- i f like driving dogs 26 and 27, both pivotally i Fig. 3 is a section taken approximately' journaled in the frame members 6 and carries a spur pinion 35 that meshes with a spur gearf36 carried by'a shaft 3T journaled in the frame members 6 and pro fided with a sprocket wheel 38. runs over the sprocket wheel 38 and over a sprocket wheel 40 carried by the countershaft 41 journaled in the frame members 6. The shaft 41 carries a spur pinion 42 that meshes with a spur gear 43 normally loose on the main countershaft- 22 but adapted to be coupled thereto, at will, for rotation therewith, by a friction clutch 14. indicated in a general way in Fig. 5 and which clutch may be of any well known or `suitable construction. f i

The vibratory saw-carrying frame 13 is under springstrain to remain in its retracted position, from a Acoiled spring 45 attached thereto and anchored to a lug v46 on one of the frame members 6,v (see particularly Fig. 3). f

The numeral 117 indicates a so-callcd scavenging blade .that slides on the upper face of the inclined deck 8 and is provided with depending,r lugs i8 that work through oblique slots49 in the deck 8. Yihe lugs 4S art connected by Lshaped links to lugs v51 on the upper portion of the vibratory saw fra-me 13. The pivotal joints between said elements 48, `:Ofand 51 are loose, so that the links 5() are capable of lateral movements as they move in the oblique slots. 119, for a purpose which will presently(l appear.; f

As shown', the extreme vibratory merel ments of the frame 13 are limited by stops members 6 preferably `made slot and. bolt conand these .stops vare slightly adjustabley by nectfions 54. i

Tosupport the `board or lumber before it is sawed or while it is being; set in position. to be sawed, there is provided a feed table 55, preferably a skeleton structure, su ably supported from the floor and suitably `counected to the saw framework. The upper surface of this feed table` is sliahtl,v7 above the inclined deck 8 so that that poi'- tion of the board that is to beisawediV off will stand sli glitly above the deck 'until it has been sawcd voil? and dropped onto said decl. For stopping' the boards in various different positions for sawing' ofl3 therefrom. of sections of diiferent lengths, 1 arovicle a stop device that includes a long' rock shaft 56 journaled in` `suitable bearings 57 on the `table 55 and projecting` freelyv above the-deck 8l The. rock shaft 56 is provided with a latch lever 58 i a notched rock t to therinner bearing` 57. 1

4That pori" iii of the rock shaft dthat overhangs the deck 84 is providedwith a multiplicity of' adjustable stop fingers 60,

A sprocket chain 39 that (to-operates withy or 59 shown secured` ,driving dog 26,

` 61 and G2. there being, as shown, three in number. These stop lingers have split hubs equipped with clamping screws 63 that adapt them to be normally frictionally secured to the shaft 56 in various different positions for rotation therewith `but with freedom for rotarv and for axial or slid ing adjustments thereon. The stop lin: ger 61 has an offset stop lugv G1 adaptedA to underlap the finger 60, andthe ystop linger 62 has a stop lug` G2n adapted to u nderlap the finger 60 and the linger `6l. lllhen the three stop lingers 60,r 61 and 62 are assembled as closely together as possible, their stop surfaces will be inthesaine vertical plane,l but the stop lug 61a will be immediately below the stop 60 and the stop lug` 62EL will be immediately below the stop lug (51a. ln all of the axialadustments of the several stop fingers', the above noted adjustment in respect to rotation should be maintained and the latch lever 53`will be arrangfjed for coeoperation with the latch arch 59 to rotate the' shaft 5G and set any oneof the three Kstop fingers in' position to intercept the movement of the board '1,' past the sar.' and toward the left in respect to Fig. 1.

lt also follows that said stop fingers, inl view of their lapping'relation. may be set to vvary by the merest fractionthe difference in the lengths of board sections `th'atjvill be stopped or set for sawingwhen they arey lnoug'htinto position. course, the variation in the lengths of the sections that they will stop in sawing;r position be ,iucreased to ani,vv vdesired extent withinvthe length of the roc-k shaft 56 toward the left from the saw inrespect to Fig.

The operatorfby manipulation L the lever 5S, which oscillatesthe shaft 56, can, by very slighty oscillatory movements, quickly bring` any one of the three stop fingers into stopping position, and this quicknesf' of action is importantespeciallyin sawing box lumber or the like wherethe operator, by quick inspection "of they board thatr'he is moving to position, must 4determine.the advisable length to cut to avoid knots and the li te. l

As statedthe mainl countershaft 22 can be thrown into action at will by manipula! tion of the clutch 114. Then said shafty is rotated. the saw-carrying frame `will be oscilla-ted backward 'and' forward 'withx a.propL-irlj timed action and with fa hesitaltingmovement which "leaves the `,saw in,its retracted position for `about one-,third of each rotation of said shafjtQQ. The spring 1-5 assists in holding` the saw and its sup, portingr frame in its retracted Iposition and, when in such position, the freelend of the` upper "d inn'. dopr Q7 will ,resty uponthe shaft as a stop andj the free ,endfof the by the spring 29,'wi1l be drawn'upward 'againstsaidshaft the`r wrist pin 25 moves upward, it"engag'e`s fthe" notch )fL of the dog 27y and, under'con-f tinued rotation ofthe shaft 22, positively moves the saw frame 13 *I forward causes the saw `to cut` olf"`the lpos board." When thesaw hasv reached engages thel shaft 22,'is'stopped thereby and the wrist pin 25 then moves out of the notch 27, but Isiir'iultaneoi'isly therewith, the wrist pin 24, which is on the opposite side of the crank disk 2S from the wrist pin 25, enters the notch 26El of the driving dog Z6 and, under its downward and rearward movement, positively forces the saw frame 13 and the saw 16 back to retracted posi-l tions, on the completion of which the dog 26 is stopped by the shaft 22 and said wrist pin 24 moves upward out of the notch 26a. The exact timing of said movements may be varied, but preferably the saw is moved forward or to its work during about onethird of the rotation of the shaft 22, is' given its return movement in :little less l than one-third of the rotation of said shaft and is left in its idle position alluring a little more than one-third of the rotation of said shaft.

At the time the saw completes its movement and the sawed-off board section .is dropped off on the deck 8, the scavenging blade 17 will be outward of said dropped board section so that under return y.nuova ment of the saw and its supporting frame, said blade will scrape said board section backward on the deck 8. Moreover, in view of the oblique slots 49,said blade 47 will be moved endwise away from the saw,thereby carrying the board section endwise out of contact with the saw. f

The efficiency of the machine above herein illustrated, described and claimed, has

' been demonstrated in actual practice.

that I claim is:

1. Ina machine of the kind described, the combination with a saw and a vibratory support therefor, of means for vibrating said support and saw comprising reversely acting driving dogs` connected to said support, and

a crank-equipped shaft alternately'operative on said dogs to oscillate said saw support.

2. In a machine ofthe kind described, the combination with a saw and a vibratory sup port therefor, of means for vibrating said support and saw comprising reversely acting driving dogs connected to said support, and a crank-equipped shaft alternately operative on said dogs ,to oscillate said saw support, said crank being out of action on both dogs for a considerable period of time while the saw and support are in retracted positions.

3. In a machine of the kind described, the combination with a saw and a vibratory support therefor, of means for vibrating said support and saw comprising reversely acting dr'ivingi'dog's fconnected to rsaid support, `a

l said crank being out of action'on both dogs forja considerableperiod of timefwhile the y sawandsupport are in retracted positions, treme forward position, the driving dog 27 anda' spring tendingl to holdsaidsaw sup-- p'ortrn its retracted'` position; f

a. Inia machine of the kinddescribed, the

combination with a supporting frame, y'an oscillatory saw support and a power-driven saw carried by said support, of upper and lower driving dogs connected to said support, and a shaft having two crank-acting wrist pins alternately engageable, one kwith each `of said driving dogs, to oscillate said saw, support, said shaft operating as stops to ydisengage said dogs from the cooperating wrist pins. g

5. In a machine of the kind described, the combination with a supporting frame, an oscillatory saw support and apower-driven saw carriedby said support, of upper'y and lower drivngdogs connected to said support, and a shaft having two crank-acting wrist pins alternately engageable, one with. each of said driving dogs, rto oscillate said saw support, said shaft operating as stops to disengagesaid dogs from the cooperatingA disengage said dogs from the cooperating wrist pins, both of said wrist pins being out of action on the co-operating wrist pins during a considerable period of time while the saw and its support are in retracted positions. y n

7. In a machine of the kind described, the combination with a supporting frame, an oscillatory saw support, a power-driven saw carried by said support, of upperl and lower driving dogs connected to saidfsupport, said dogs being laterally offset and provided with opposing notches inward of their free ends, the upper dog being yieldingly pressed downward and the lower dog being yieldingly pressed upward, a power-driven shaft extended between saiddogs, a diskcarriedy by said shaft and provided on its opposite faces with wrist pins set one ahead of the oscillatory saw support, a power-driven saw carried byv said support, of upper. and .lower driving# dogs connected to said support, Vsaid dogs being `laterally offset and providedwith opposing notches inward of their free lends, the upper dog being yieldingly pressed downward and the lower ydogrbeing` yieldingly dressed upward, a power-driven shaft extended between-said dogs, av disk carried by saidy shaft andprovided. on its opposite faces'withi Wrist pins-,set oneI ahead ofthe other and (zo-operating onewitheaeh ofisaid dogs tofoseillate said-saw support-,said shaft operating .as a stop=to disengage said' dogs from said Wrist pins with properly timed l5 In testimony whereof I aix my signature. 2O

CHARLES JOHNSON. 

